The Canadian Food Inspection Agency (CFIA) has announced temporary import restrictions on livestock, including horses, from Texas following the confirmation of New World screwworm (NWS) in a calf in the state. Effective immediately, animals originating from or present in Texas within 21 days before crossing the border will not be permitted entry into Canada.

The CFIA says the measure is intended to reduce the risk of introducing the parasite, whose flesh-eating larvae can cause severe and potentially fatal damage to warm-blooded animals. Although Canada’s climate is unsuitable for the fly’s long-term survival, the agency notes it could persist during warmer summer months.

Veterinarians and animal owners are urged to watch for signs of infestation, including wounds that worsen over time and are accompanied by discharge or a foul odour. Travelers returning from Texas with companion animals are also advised to inspect their pets regularly for signs of illness.

NWS is an immediately notifiable disease in Canada, and suspected cases should be reported to a veterinarian for laboratory confirmation. The CFIA says it will continue monitoring the situation and adjust restrictions as necessary.